Welding Preheat Temperature
Estimate the preheat temperature for welding, Tp = 350·√(CE − 0.25), as a function of the steel's carbon equivalent (CE). Preheating reduces the cooling rate, giving hydrogen time to escape and preventing the formation of brittle martensite and cold cracks in the heat-affected zone. Steels with a high CE require more preheating. Enter the steel's carbon equivalent.
Resultado
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Temperatura de pré-aquecimento
Por que aquecer uma peça antes de soldá-la? Para domar o resfriamento. Quando o cordão quente esfria rápido demais sobre um metal frio e espesso, três vilões se juntam: forma-se martensita (microestrutura dura e frágil) na zona afetada pelo calor, o hidrogênio dissolvido não tem tempo de escapar e fica aprisionado, e surgem tensões de contração. O resultado é a trinca a frio (ou trinca induzida por hidrogênio), que pode aparecer horas ou dias após a soldagem. O pré-aquecimento desacelera o resfriamento, dando tempo para o hidrogênio difundir e evitando a martensita. A estimativa Tp = 350·√(CE − 0,25) liga a temperatura ao carbono equivalente do aço: quanto mais ligado o aço, mais quente o pré-aquecimento (de zero, para aços doces, a 200 °C ou mais em aços de alta liga e grande espessura). Informe o carbono equivalente do aço.
Related Tools
Carbon Equivalent (CEq)
Compute a steel's carbon equivalent by the (simplified) IIW formula, CEq = C + Mn/6 + Cr/5 + Ni/15, weighting the alloying elements' effect relative to carbon on the hardening and cracking tendency. It is the key weldability index: a CEq below 0.40 indicates easily weldable steel; above 0.45–0.50 it requires preheating and care to avoid cold cracking. Enter the carbon, manganese, chromium and nickel contents (%).
Electrode Consumption
Estimate the number of electrodes needed for a weld by dividing the total mass of metal to deposit by the mass deposited per electrode (rounding up). It is a practical planning and budgeting calculation in stick-electrode welding, avoiding over-buying or stopping the job for lack of consumables. Enter the total weld mass and the mass deposited per electrode.
Weld Deposition Rate
Compute a weld's deposition rate by dividing the mass of deposited metal by the arc-on time, giving kg/h. It is a central indicator of process productivity: processes like submerged arc and MIG/MAG have far higher rates than stick electrode. Combined with the operating factor (actual arc time), it estimates a joint's output. Enter the deposited mass and the arc time.
The results provided by this tool are for general informational and educational purposes only and do not constitute professional, financial, medical, legal, tax or accounting advice. Always confirm important decisions with a qualified professional and official sources.